Singh was critical of the prime minister for not speaking on issues like beef or communal riots in Muzaffarnagar and elsewhere.
Stating that "people don't believe the government", the former prime minister said, "when they (apparently industrialists) go and call on the ministers, they say the right things, but when they come out, all of them say that nothing much has changed... There is today a crisis of confidence in the government."
"I don't know. I cannot read his mind. But he is the prime minister of all the people of India and he must give every Indian the confidence that in him we have a prime minister who cares for our well-being," he told India Today.
Reacting to his remarks, Union Minister Nirmala Sitharaman said the criticism was "misplaced" while adding that the Modi government had launched a host of schemes like Mudra and Jan Dhan besides other welfare measures for the downtrodden and weaker sections of society.
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Replying to a question, Singh said during the 2008
"But today it seems to me there is a lack of confidence within the business community. I can't make out what it is... When they talk to the civil servants, they tell them they don't know who the boss is...
"When we were in government, the business community talked a great deal about tax terrorism. I continue to hear the same talk from the business community when they come and talk to me," he said.
Asked what the Modi government should do, Singh said first they have to recognise that the bonanza in oil was not going to last forever.
"For example, the bank credit is not moving--the rate of growth of bank credit is much lower than what would be the case if the economy was on an upward trend," he said.
To a question on the government's foreign policy, the former prime minister said the relations with major powers had improved but that was also the case with his government.
Saying that the real test of foreign policy was in the handling of neighbours, he said the Modi government's handling of Pakistan was "inconsistent". "It has been one step forward, two steps back."
Singh said he did not know if the prime minister's quick trip to Lahore was well "thought-out".
"He said he was in Kabul when he spoke to Nawaz Sharif,
Asked about the government's performance so far, the former prime minister there is a growing view that the BJP is not able to deliver in areas in which it had made huge promises.
Replying to questions, Singh said when he talked to the PM once or twice, he had told him that Modi had to reach out to the opposition much more effectively than has been the case.
"There has been no serious discussion with the Congress, whether it is on foreign policy or domestic policy and even on the GST."
"I told him that this is not a task on which I can deliver. They are the two most important leaders of our party, and until the government establishes some rapport with Soniaji and Rahul, the Congress party cannot be taken for granted. You cannot have a situation, where you foist cases like National Herald and then expect..."
When told that in Parliament it was increasingly clear that the treasury and opposition benches were hardly talking to each other, Singh said "That is not good for democracy, for the country. There is unwanted bitterness between the two sides. It does not have to be that way."
To a question on scams and scandals in the last couple of years during his government, and whether he felt sad that his last years were shrouded by them, he said he really felt sad that the BJP disrupted Parliament and the government never had the opportunity to put its view on what really happened.
Asked if he was bitter about that, Singh said "I am not bitter about anything but it hurts me. I had not entered politics to make money for myself, my family or friends. And I felt very sad and hurt when the BJP members would walk into the well of the House and say 'pradhan mantri chor hai'. That really hurt me.